Benefits of Petralex®:- Easy to use - no special devices, no battery replacements or all-day wearing annoyance; - Quick Setup for any sound environment;- Increased sampling rate - 44.1 kHz, providing the best sound quality; - Easy switching between device and headset microphones;- Full acoustic gain up to 30 dB with a standard headset;- Minimum signal processing delay - just 6,3-15,7 ms (depending on the model and software running simultaneously); - Use the built-in mic to catch sound from distant sources, i.e. in classroom, at theatre (or use it as a spy-ear!);- Easy profile sync for all of your Android powered devices with Dropbox cloud storage support;- Setup and adjust the app without visiting a specialist;- BT headset support (for processed sound playback only, sound is captured by device onboard mic).You can compare the original and processed sound test phrases on our site www.petralex.pro.Petralex® Hearing Aid is absolutely free to use because of your support. If you find the app useful, please support developers with donation at www.petralex.pro/donate *Disclaimer: The Petralex® app is not approved as a medical device or software and cannot be used as a hearing aid with doctor`s prescription. Audiometric test provided in the application can be used only for app adjustment. Testing results are not a substitute for professional audiology tests and cannot be considered as a basis for diagnosis.Keep in touch: https://www.facebook.com/Petralex.EN https://twitter.com/PetralexEN